I suppose the best bet is to transcode the Xvid file to MPEG-2 using VLC, specifying one of the audio tracks. In Windows, the options I'd use to do this are: :sout=#transcode{vcodec=mp2v,vb=8192,deinterlace,audio-sync,acodec=mpga,ab=192,channels=2}:duplicate{dst=std{access=file,mux=ps,dst="outp...